China Civil UAV Theory Questions — Questions 501–510

UAV-Q0501. Wind shear occurring in the lower layer seriously affects aircraft takeoff and landing. This wind shear in this layer is called low-level wind shear. Low-level wind shear is generally about ______ above ground.

Explanation

Low-level wind shear refers to wind shear occurring below 600 meters above ground; just memorize the value.

UAV-Q0502. The basic conditions for thunderstorm formation are:

Explanation

Thunderstorm formation requires three conditions: sufficient water vapor, an unstable atmosphere, and sufficient upward motion (lifting force).

UAV-Q0503. Dew point temperature is the temperature at which air cools to saturation with unchanged water vapor content and pressure — vividly, the temperature at which water vapor in the air becomes dew. Which of the following is correct?

Explanation

When water vapor is saturated, air temperature equals dew point temperature; when unsaturated, air temperature is higher than dew point temperature; at 100% relative humidity, air temperature equals dew point temperature.

UAV-Q0504. 32 degrees Fahrenheit is 0 degrees Celsius. What is 59 degrees Fahrenheit in Celsius?

Explanation

Using the formula C = (5/9) × (F − 32): C = (5/9) × (59 − 32) = 15°C.

UAV-Q0505. Moving the takeoff site from Beijing to Lhasa, which type of UAV's altitude performance is most seriously affected?

Explanation

Lhasa is a high plateau with thin air; fuel-powered fixed-wing engines lose more power from insufficient intake air, suffering the greatest impact.

UAV-Q0506. From what material can wind, cloud, temperature, turbulence, icing, and similar conditions at route altitude be learned in advance?

Explanation

En route weather forecast charts are designed for routes, providing wind, cloud, temperature, and other meteorological elements at route altitudes, plus turbulence, icing, and similar information.

UAV-Q0507. Ice, frost, snow, and similar matter on an aircraft's outer surfaces:

Explanation

Ice, frost, and snow roughen the aircraft surface, increasing drag, spoiling the aerodynamic shape, and reducing lift. Options A and B are wrong.

UAV-Q0508. The three major meteorological elements are:

Explanation

Among the physical quantities describing atmospheric state, temperature, pressure, and air humidity are called the three major meteorological elements.

UAV-Q0509. There are mainly three weather backgrounds that can produce significant low-level wind shear:

Explanation

The main weather backgrounds producing significant low-level wind shear are severe convective weather, frontal weather, and radiation-inversion low-level jet weather; these three significantly affect airflow speed and direction.

UAV-Q0510. A warm front is:

Explanation

Study note: for a warm front, look for the warm air mass. A warm front is a front where the warm air mass actively moves toward the cold air mass, pushing the front toward the cold air mass side.